Ask most buyers what their deposit percentage is, and they'll answer easily. Ask what their loan-to-value (LTV) is, and fewer will — even though LTV, not deposit size on its own, is the number that actually sets which rate tier a UK lender offers.
LTV is the Mirror Image of Your Deposit
LTV = mortgage amount ÷ property value, expressed as a percentage. A 25% deposit means a 75% LTV. It sounds like the same information stated differently, but lenders publish entire rate sheets organized by LTV band — 95%, 90%, 85%, 80%, 75%, 60% — not by deposit percentage, and pricing often steps down noticeably at each threshold rather than moving smoothly.
Why the Bands Matter
Each LTV band represents a different risk tier to the lender. A 95% LTV mortgage (5% deposit) leaves very little equity cushion if property values dip, so lenders price that risk in with a higher rate. Crossing into a lower band — say, from 80% to 75% LTV — often unlocks a meaningfully better rate, sometimes enough to justify finding a few thousand extra pounds of deposit specifically to clear the threshold.
Worked Example
A £350,000 property at three different deposit levels:
| Deposit | LTV | Mortgage Amount | Typical Rate Tier |
|---|---|---|---|
| 5% (£17,500) | 95% | £332,500 | Highest tier — smallest cushion for the lender |
| 15% (£52,500) | 85% | £297,500 | Meaningfully better than 90-95% tier |
| 25% (£87,500) | 75% | £262,500 | Sweet-spot band threshold |
| 40% (£140,000) | 60% | £210,000 | Best available tier at most lenders |
The exact rate gap between tiers moves with the market, but the pattern — meaningfully better pricing as LTV drops, especially at 90%, 80%, 75%, and 60% — holds consistently across lenders.
Common Mistakes
Buyers frequently focus on the deposit amount in isolation without checking which LTV band it lands them in — two buyers with £50,000 deposits on different-priced homes can land in completely different LTV tiers with very different rate offers.
Buyers also forget that LTV is recalculated at remortgage based on the current property valuation, not the original purchase price — rising property values can push an existing borrower into a better LTV band naturally, without any extra payment at all, which is worth checking before assuming your rate options haven't changed.
A third mistake: not accounting for the mortgage default insurance-adjacent products some 90%+ LTV lenders build into pricing (distinct from the mortgage guarantee scheme mechanics that support them) — the headline rate on very high-LTV products sometimes includes costs that aren't obvious from the rate alone.
Where This Calculator Has Limits
It shows the general pattern of LTV bands, but exact rate differences between tiers vary by lender, product type, and current market conditions — it can't quote you a specific rate without checking live lender rate sheets. It also doesn't account for how a valuation coming in lower than the purchase price can shift your actual LTV at completion, even if your deposit percentage against the agreed price looked fine on paper.
Frequently Asked Questions
Is a lower LTV always better?
For rate pricing, generally yes — but it means committing more cash upfront, which has its own opportunity cost worth weighing.
Does LTV change over the life of my mortgage?
Yes — as you pay down the balance and/or the property value changes, your LTV shifts, which can open up better remortgage options over time.
What's considered a "good" LTV in the UK market?
75% or below is widely treated as a meaningful pricing threshold, with 60% typically unlocking the very best available rates.
Can a low valuation at completion change my LTV unexpectedly?
Yes — if the property is valued below the agreed purchase price, your LTV against that lower valuation is higher than you planned, potentially moving you into a worse rate tier or requiring a larger deposit to compensate.
Does LTV affect buy-to-let mortgages the same way?
The concept is the same, but BTL affordability is driven primarily by rental coverage (see our Buy-to-Let Calculator), with LTV as a secondary factor rather than the primary qualifying test.
Related Tools
Mortgage Calculator · Remortgage Tool · Buy-to-Let Calculator
Educational content, not financial advice. LTV rate tiers vary by lender and change with market conditions — confirm current rate bands with a licensed UK mortgage adviser. Written by the MortgagePro Global team.